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EP0646932A4 - Circuit for decoding variable-length code, and system for decoding variable-length code which uses the circuit. - Google Patents

Circuit for decoding variable-length code, and system for decoding variable-length code which uses the circuit.

Info

Publication number
EP0646932A4
EP0646932A4 EP94912701A EP94912701A EP0646932A4 EP 0646932 A4 EP0646932 A4 EP 0646932A4 EP 94912701 A EP94912701 A EP 94912701A EP 94912701 A EP94912701 A EP 94912701A EP 0646932 A4 EP0646932 A4 EP 0646932A4
Authority
EP
European Patent Office
Prior art keywords
circuit
cam cell
cell
length code
match line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94912701A
Other languages
German (de)
French (fr)
Other versions
EP0646932A1 (en
EP0646932B1 (en
Inventor
Eiji Komoto
Takao Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0646932A1 publication Critical patent/EP0646932A1/en
Publication of EP0646932A4 publication Critical patent/EP0646932A4/en
Application granted granted Critical
Publication of EP0646932B1 publication Critical patent/EP0646932B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory
    • H03M7/425—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory for the decoding process only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/005—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor comprising combined but independently operative RAM-ROM, RAM-PROM, RAM-EPROM cells
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
    • G11C15/04—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores using semiconductor elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A circuit comprising a pair of a CAM cell (10) for storing variable-length codes and a RAM cell (20) for storing data used for mask processing. This circuit further has an NMOS (30) which is connected between the CAM cell (10) and a match line ML, and cuts off the CAM cell (10) from the match line ML by use of the output of the RAM cell (20). The CAM cell (10) checks a code applied from the outside with the code stored in it. If these codes are agreed with each other, the CAM cell (10) outputs an H level signal which represents the agreement to the match line ML. If disagreed, it outputs an L level signal which represents the disagreement to the match line ML. If the CAM cell does not engage in the checking operation, the corresponding RAM cell (20) outputs an L level signal to turn off the NMOS (30). When the NMOS is turned off, the output from the CAM cell (10) is not transmitted to the match line ML.
EP94912701A 1993-04-19 1994-04-19 Circuit for decoding variable-length code, and system for decoding variable-length code which uses the circuit Expired - Lifetime EP0646932B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP9161993 1993-04-19
JP9162093 1993-04-19
JP91620/93 1993-04-19
JP91619/93 1993-04-19
JP9162093 1993-04-19
JP9161993 1993-04-19
PCT/JP1994/000646 WO1994024672A1 (en) 1993-04-19 1994-04-19 Circuit for decoding variable-length code, and system for decoding variable-length code which uses the circuit

Publications (3)

Publication Number Publication Date
EP0646932A1 EP0646932A1 (en) 1995-04-05
EP0646932A4 true EP0646932A4 (en) 1996-10-02
EP0646932B1 EP0646932B1 (en) 2001-09-26

Family

ID=26433064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912701A Expired - Lifetime EP0646932B1 (en) 1993-04-19 1994-04-19 Circuit for decoding variable-length code, and system for decoding variable-length code which uses the circuit

Country Status (4)

Country Link
US (1) US5642114A (en)
EP (1) EP0646932B1 (en)
DE (1) DE69428408T2 (en)
WO (1) WO1994024672A1 (en)

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JP2812262B2 (en) * 1995-08-31 1998-10-22 日本電気株式会社 Associative memory
US5835035A (en) * 1995-12-28 1998-11-10 Philips Electronics North America Corporation High performance variable length decoder with two-word bit stream segmentation and related method
US6026326A (en) * 1997-01-13 2000-02-15 Medtronic, Inc. Apparatus and method for treating chronic constipation
US5940852A (en) * 1997-05-01 1999-08-17 Altera Corporation Memory cells configurable as CAM or RAM in programmable logic devices
US6263400B1 (en) * 1997-08-21 2001-07-17 Altera Corporation Memory cells configurable as CAM or RAM in programmable logic devices
US5936873A (en) * 1997-09-30 1999-08-10 Sun Microsystems, Inc. Single ended match sense amplifier
US6078987A (en) * 1997-09-30 2000-06-20 Sun Microsystems, Inc. Translation look aside buffer having separate RAM arrays which are accessable with separate enable signals
US6199140B1 (en) 1997-10-30 2001-03-06 Netlogic Microsystems, Inc. Multiport content addressable memory device and timing signals
US6130631A (en) * 1998-05-11 2000-10-10 Oak Technology, Inc. Method and apparatus utilizing a simplified content-addressable memory for JPEG decoding
US6892272B1 (en) 1999-02-23 2005-05-10 Netlogic Microsystems, Inc. Method and apparatus for determining a longest prefix match in a content addressable memory device
US6574702B2 (en) 1999-02-23 2003-06-03 Netlogic Microsystems, Inc. Method and apparatus for determining an exact match in a content addressable memory device
US6499081B1 (en) 1999-02-23 2002-12-24 Netlogic Microsystems, Inc. Method and apparatus for determining a longest prefix match in a segmented content addressable memory device
US6460112B1 (en) 1999-02-23 2002-10-01 Netlogic Microsystems, Llc Method and apparatus for determining a longest prefix match in a content addressable memory device
US6539455B1 (en) 1999-02-23 2003-03-25 Netlogic Microsystems, Inc. Method and apparatus for determining an exact match in a ternary content addressable memory device
US6137707A (en) * 1999-03-26 2000-10-24 Netlogic Microsystems Method and apparatus for simultaneously performing a plurality of compare operations in content addressable memory device
US6317349B1 (en) 1999-04-16 2001-11-13 Sandisk Corporation Non-volatile content addressable memory
US6166938A (en) * 1999-05-21 2000-12-26 Sandisk Corporation Data encoding for content addressable memories
US6157558A (en) * 1999-05-21 2000-12-05 Sandisk Corporation Content addressable memory cell and array architectures having low transistor counts
JP3415481B2 (en) * 1999-05-27 2003-06-09 Ｎｅｃエレクトロニクス株式会社 Variable length code decoding device
US6944709B2 (en) 1999-09-23 2005-09-13 Netlogic Microsystems, Inc. Content addressable memory with block-programmable mask write mode, word width and priority
US7272027B2 (en) * 1999-09-23 2007-09-18 Netlogic Microsystems, Inc. Priority circuit for content addressable memory
US6934795B2 (en) * 1999-09-23 2005-08-23 Netlogic Microsystems, Inc. Content addressable memory with programmable word width and programmable priority
US7143231B1 (en) 1999-09-23 2006-11-28 Netlogic Microsystems, Inc. Method and apparatus for performing packet classification for policy-based packet routing
US6154384A (en) * 1999-11-12 2000-11-28 Netlogic Microsystems, Inc. Ternary content addressable memory cell
US6134135A (en) * 2000-01-10 2000-10-17 Switchcore, A.B. Mask arrangement for scalable CAM/RAM structures
US6615310B1 (en) * 2000-05-18 2003-09-02 International Business Machines Corporation Lossless data compressor with all CAM words available
FR2813698B1 (en) * 2000-09-04 2002-11-29 St Microelectronics Sa MASKING HIDDEN CELL
US6452822B1 (en) 2001-04-26 2002-09-17 International Business Machines Corporation Segmented match line arrangement for content addressable memory
JP3808753B2 (en) * 2001-10-31 2006-08-16 川崎マイクロエレクトロニクス株式会社 Associative memory device
US20030090921A1 (en) * 2001-11-15 2003-05-15 Afghahi Morteza Cyrus Content addressable memory match line sensing techniques
EP2104236B1 (en) * 2007-01-19 2018-08-15 Mitsubishi Electric Corporation Table device, variable-length encoding device, variable-length decoding device, and variable-length encoding/decoding device
US9697899B1 (en) * 2015-12-21 2017-07-04 Intel Corporation Parallel deflate decoding method and apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173695A (en) * 1990-06-29 1992-12-22 Bell Communications Research, Inc. High-speed flexible variable-length-code decoder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4670858A (en) * 1983-06-07 1987-06-02 Tektronix, Inc. High storage capacity associative memory
JPH0692228B2 (en) * 1988-08-04 1994-11-16 株式会社クボタ Work vehicle steering structure
JPH0312896A (en) * 1989-06-09 1991-01-21 Fujitsu Ltd Semiconductor memory
JP3063180B2 (en) * 1991-02-13 2000-07-12 富士通株式会社 Variable length code decoding circuit
JP3036868B2 (en) * 1991-03-07 2000-04-24 沖電気工業株式会社 Variable length decoder
JP3054787B2 (en) * 1991-09-02 2000-06-19 セイコーエプソン株式会社 Variable length code decoding device
US5245338A (en) * 1992-06-04 1993-09-14 Bell Communications Research, Inc. High-speed variable-length decoder
JP2741836B2 (en) * 1993-02-22 1998-04-22 現代電子産業株式会社 Adaptive variable length encoder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173695A (en) * 1990-06-29 1992-12-22 Bell Communications Research, Inc. High-speed flexible variable-length-code decoder

Also Published As

Publication number Publication date
WO1994024672A1 (en) 1994-10-27
EP0646932A1 (en) 1995-04-05
DE69428408T2 (en) 2002-05-29
DE69428408D1 (en) 2001-10-31
EP0646932B1 (en) 2001-09-26
US5642114A (en) 1997-06-24

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